ip/link_vti.c

   1 /*
   2  * link_vti.c   VTI driver module
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Herbert Xu <herbert@gondor.apana.org.au>
  10  *          Saurabh Mohan <saurabh.mohan@vyatta.com> Modified link_gre.c for VTI
  11  */
  12
  13 #include <string.h>
  14 #include <net/if.h>
  15 #include <sys/types.h>
  16 #include <sys/socket.h>
  17 #include <arpa/inet.h>
  18
  19 #include <linux/ip.h>
  20 #include <linux/if_tunnel.h>
  21 #include "rt_names.h"
  22 #include "utils.h"
  23 #include "ip_common.h"
  24 #include "tunnel.h"
  25
  26
  27 static void print_usage(FILE *f)
  28 {
  29         fprintf(f,
  30                 "Usage: ... vti [ remote ADDR ]\n"
  31                 "               [ local ADDR ]\n"
  32                 "               [ [i|o]key KEY ]\n"
  33                 "               [ dev PHYS_DEV ]\n"
  34                 "               [ fwmark MARK ]\n"
  35                 "\n"
  36                 "Where: ADDR := { IP_ADDRESS }\n"
  37                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  38                 "       MARK := { 0x0..0xffffffff }\n"
  39         );
  40 }
  41
  42 static void usage(void) __attribute__((noreturn));
  43 static void usage(void)
  44 {
  45         print_usage(stderr);
  46         exit(-1);
  47 }
  48
  49 static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
  50                          struct nlmsghdr *n)
  51 {
  52         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  53         struct {
  54                 struct nlmsghdr n;
  55                 struct ifinfomsg i;
  56         } req = {
  57                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  58                 .n.nlmsg_flags = NLM_F_REQUEST,
  59                 .n.nlmsg_type = RTM_GETLINK,
  60                 .i.ifi_family = preferred_family,
  61                 .i.ifi_index = ifi->ifi_index,
  62         };
  63         struct nlmsghdr *answer = NULL;
  64         struct rtattr *tb[IFLA_MAX + 1];
  65         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  66         struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
  67         unsigned int ikey = 0;
  68         unsigned int okey = 0;
  69         unsigned int saddr = 0;
  70         unsigned int daddr = 0;
  71         unsigned int link = 0;
  72         unsigned int fwmark = 0;
  73         int len;
  74
  75         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
  76                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
  77 get_failed:
  78                         fprintf(stderr,
  79                                 "Failed to get existing tunnel info.\n");
  80                         free(answer);
  81                         return -1;
  82                 }
  83
  84                 len = answer->nlmsg_len;
  85                 len -= NLMSG_LENGTH(sizeof(*ifi));
  86                 if (len < 0)
  87                         goto get_failed;
  88
  89                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
  90
  91                 if (!tb[IFLA_LINKINFO])
  92                         goto get_failed;
  93
  94                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
  95
  96                 if (!linkinfo[IFLA_INFO_DATA])
  97                         goto get_failed;
  98
  99                 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
 100                                     linkinfo[IFLA_INFO_DATA]);
 101
 102                 if (vtiinfo[IFLA_VTI_IKEY])
 103                         ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]);
 104
 105                 if (vtiinfo[IFLA_VTI_OKEY])
 106                         okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]);
 107
 108                 if (vtiinfo[IFLA_VTI_LOCAL])
 109                         saddr = rta_getattr_u32(vtiinfo[IFLA_VTI_LOCAL]);
 110
 111                 if (vtiinfo[IFLA_VTI_REMOTE])
 112                         daddr = rta_getattr_u32(vtiinfo[IFLA_VTI_REMOTE]);
 113
 114                 if (vtiinfo[IFLA_VTI_LINK])
 115                         link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]);
 116
 117                 if (vtiinfo[IFLA_VTI_FWMARK])
 118                         fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]);
 119
 120                 free(answer);
 121         }
 122
 123         while (argc > 0) {
 124                 if (!matches(*argv, "key")) {
 125                         unsigned int uval;
 126
 127                         NEXT_ARG();
 128                         if (strchr(*argv, '.'))
 129                                 uval = get_addr32(*argv);
 130                         else {
 131                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 132                                         fprintf(stderr,
 133                                                 "Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
 134                                         exit(-1);
 135                                 }
 136                                 uval = htonl(uval);
 137                         }
 138
 139                         ikey = okey = uval;
 140                 } else if (!matches(*argv, "ikey")) {
 141                         unsigned int uval;
 142
 143                         NEXT_ARG();
 144                         if (strchr(*argv, '.'))
 145                                 uval = get_addr32(*argv);
 146                         else {
 147                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 148                                         fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
 149                                         exit(-1);
 150                                 }
 151                                 uval = htonl(uval);
 152                         }
 153                         ikey = uval;
 154                 } else if (!matches(*argv, "okey")) {
 155                         unsigned int uval;
 156
 157                         NEXT_ARG();
 158                         if (strchr(*argv, '.'))
 159                                 uval = get_addr32(*argv);
 160                         else {
 161                                 if (get_unsigned(&uval, *argv, 0) < 0) {
 162                                         fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
 163                                         exit(-1);
 164                                 }
 165                                 uval = htonl(uval);
 166                         }
 167                         okey = uval;
 168                 } else if (!matches(*argv, "remote")) {
 169                         NEXT_ARG();
 170                         daddr = get_addr32(*argv);
 171                 } else if (!matches(*argv, "local")) {
 172                         NEXT_ARG();
 173                         saddr = get_addr32(*argv);
 174                 } else if (!matches(*argv, "dev")) {
 175                         NEXT_ARG();
 176                         link = if_nametoindex(*argv);
 177                         if (link == 0) {
 178                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 179                                         *argv);
 180                                 exit(-1);
 181                         }
 182                 } else if (strcmp(*argv, "fwmark") == 0) {
 183                         NEXT_ARG();
 184                         if (get_u32(&fwmark, *argv, 0))
 185                                 invarg("invalid fwmark\n", *argv);
 186                 } else
 187                         usage();
 188                 argc--; argv++;
 189         }
 190
 191         addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
 192         addattr32(n, 1024, IFLA_VTI_OKEY, okey);
 193         addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, 4);
 194         addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, 4);
 195         addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark);
 196         if (link)
 197                 addattr32(n, 1024, IFLA_VTI_LINK, link);
 198
 199         return 0;
 200 }
 201
 202 static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 203 {
 204         const char *local = "any";
 205         const char *remote = "any";
 206         __u32 key;
 207         unsigned int link;
 208         char s2[IFNAMSIZ];
 209
 210         if (!tb)
 211                 return;
 212
 213         if (tb[IFLA_VTI_REMOTE]) {
 214                 unsigned int addr = rta_getattr_u32(tb[IFLA_VTI_REMOTE]);
 215
 216                 if (addr)
 217                         remote = format_host(AF_INET, 4, &addr);
 218         }
 219
 220         print_string(PRINT_ANY, "remote", "remote %s ", remote);
 221
 222         if (tb[IFLA_VTI_LOCAL]) {
 223                 unsigned int addr = rta_getattr_u32(tb[IFLA_VTI_LOCAL]);
 224
 225                 if (addr)
 226                         local = format_host(AF_INET, 4, &addr);
 227         }
 228
 229         print_string(PRINT_ANY, "local", "local %s ", local);
 230
 231         if (tb[IFLA_VTI_LINK] &&
 232             (link = rta_getattr_u32(tb[IFLA_VTI_LINK]))) {
 233                 const char *n = if_indextoname(link, s2);
 234
 235                 if (n)
 236                         print_string(PRINT_ANY, "link", "dev %s ", n);
 237                 else
 238                         print_uint(PRINT_ANY, "link_index", "dev %u ", link);
 239         }
 240
 241         if (tb[IFLA_VTI_IKEY] &&
 242             (key = rta_getattr_u32(tb[IFLA_VTI_IKEY])))
 243                 print_0xhex(PRINT_ANY, "ikey", "ikey %#x ", ntohl(key));
 244
 245
 246         if (tb[IFLA_VTI_OKEY] &&
 247             (key = rta_getattr_u32(tb[IFLA_VTI_OKEY])))
 248                 print_0xhex(PRINT_ANY, "okey", "okey %#x ", ntohl(key));
 249
 250         if (tb[IFLA_VTI_FWMARK]) {
 251                 __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
 252
 253                 if (fwmark) {
 254                         SPRINT_BUF(b1);
 255
 256                         snprintf(b1, sizeof(b1), "0x%x", fwmark);
 257                         print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
 258                 }
 259         }
 260 }
 261
 262 static void vti_print_help(struct link_util *lu, int argc, char **argv,
 263         FILE *f)
 264 {
 265         print_usage(f);
 266 }
 267
 268 struct link_util vti_link_util = {
 269         .id = "vti",
 270         .maxattr = IFLA_VTI_MAX,
 271         .parse_opt = vti_parse_opt,
 272         .print_opt = vti_print_opt,
 273         .print_help = vti_print_help,
 274 };